PAWEŁ JURCZAK; DOMINIK MAŁEK; PAWEŁ PUCZEL; MARTA SIWEK; KLAUDIA SZTABA. CLINICAL UTILITY OF CYFRA 21-1 IN ONCOLOGY: A COMPREHENSIVE REVIEW OF CURRENT EVIDENCE AND FUTURE DIRECTIONS. International Journal of Innovative Technologies in Social Science, v. 5, n. 4(48), 30 Dec. 2025.